diff --git a/docs/src/display.md b/docs/src/display.md
index a1f016d8..7416216e 100644
--- a/docs/src/display.md
+++ b/docs/src/display.md
@@ -6,6 +6,20 @@ variable `UNITFUL_FANCY_EXPONENTS` to either `true` or `false` to force using or
 the exponents. You can also set the `:fancy_exponent` IO context property to either `true`
 or `false` to force using or not using the exponents.
 
+## Specifying precision
+
+If you need to set precision of displayed value of your unitful quantity, you can use the
+`round` function as follows:
+
+```julia
+julia> d = 1.7438748921932u"mm"
+1.7438748921932 mm
+
+julia> round(typeof(d), d; sigdigits=3)
+1.74 mm
+```
+
+
 ```@docs
 Unitful.BracketStyle
 Unitful.abbr